Removing grinder residue from glass

[TT86]

Hello folks

Just had our driveway replaced which included some concrete and rebar being cut.

Just noticed a couple of windows have angle grinder residue on them. Only small spots but ground floor and noticeable. UVPC sashs and only a year old.

Tried some auto clay which didn't touch it.

Any other ideas? Razor potentially?

I haven't discussed with the contractor yet however the chaps were grinding right by the house so it's definitely them.

[dundarach]

Isn't that burnt into the glass?

Think it might be burnt glass there old chap sadly!

[finlo]

Grinder sparks can melt into the glass, had it happen to my car at a ford main dealer who then denied all knowledge!

[dingg]

Are you pointing out a spot which is about 1mm or so?

If so, I'd just forget about it and get on with my day.

Bigger things to get excited about in life ime.

[TT86]

dingg said:

Are you pointing out a spot which is about 1mm or so?

If so, I'd just forget about it and get on with my day.

Bigger things to get excited about in life ime.

Probably a couple of mm but right at eyeline in the year old window by my front door so it has aggrieved me a little.

My post was to see if there was a simple way to remove it, I'm not getting excited about it don't worry.

[TT86]

dundarach said:

Isn't that burnt into the glass?

Think it might be burnt glass there old chap sadly!

It feels on the surface but you are probably right in that it's burnt in.

[dundarach]

TT86 said:

dingg said:

Are you pointing out a spot which is about 1mm or so?

If so, I'd just forget about it and get on with my day.

Bigger things to get excited about in life ime.

Probably a couple of mm but right at eyeline in the year old window by my front door so it has aggrieved me a little.

My post was to see if there was a simple way to remove it, I'm not getting excited about it don't worry.

I think it's melted glass, you can't rub it out as it's the surface itself.

I'd stop and talk to the contractor, however without any CCTV (ring??) you're out of luck.

Home insurance or forget I expect.

[TT86]

dundarach said:

I think it's melted glass, you can't rub it out as it's the surface itself.

I'd stop and talk to the contractor, however without any CCTV (ring??) you're out of luck.

Home insurance or forget I expect.

I'll have a chat with him, I haven't paid the last installment yet so expect he will be reasonable however I don't intend to fall out over it. Definitely wouldn't claim on the home insurance.

Probably just one of those things, albeit frustrating when a simple dust sheet or cutting further away from the house would prevent it!

[5s Alive]

If its ferrous you could try a spot of this. Dissolves ferrous contamination on paintwork and is fine on glass. Rotten egg odour though...

Cup the area with a small bit of tape to prevent it running off.

Spaying the whole window would show the full extent of contamination.

[JoshSm]

Depends, but both iron and concrete are affected by acids in a way that glass isn't so there might be an option to use something suitably mild like citric or maybe phosphoric on it, maybe gelled first.

If it melted on there'll still be a mark but you might at least shift the debris.

Not sure what it would do to the frames though, white uPVC can get discoloured by some things.

[TT86]

5s Alive said:

If its ferrous you could try a spot of this. Dissolves ferrous contamination on paintwork and is fine on glass. Rotten egg odour though...

Cup the area with a small bit of tape to prevent it running off.

Spaying the whole window would show the full extent of contamination.

That's a good shout thanks, deffo ferrous as rust specs on the UVPC but these appear to come off with some rubbing.

I may well have some iron X or similar in the shed. If it leaves a pock mark I can live with that as at least won't catch my eye as the black mark currently does.

[simon_harris]

I was going to suggest ironx, if you are brave you can sand, flat and polish glass...

[JPC63]

Ahh, angle grinder, not the app then.

[Magooagain]

New Stanley blade should get it off but there may be a small mark afterwards.

It happened to me on a job and I managed to clear it with a blade.

[Chumley.mouse]

Another vote for iron x. , I've removed some stuck on grinder spots off car glass before with it . It just dissolves it off like it does on car wheels.

[TT86]

Chumley.mouse said:

Another vote for iron x. , I've removed some stuck on grinder spots off car glass before with it . It just dissolves it off like it does on car wheels.

Smashing thankyou sounds promising. Typically I don't have any left so will pick some up to try.

[Chumley.mouse]

Its good stuff, Not sure why it smells so bad ….they make cherry flavoured but it smells rancid …….tip don’t get it on your hands and might need a few goes and a bit of a scrub with a toothbrush.

Good luck.

[KAgantua]

My experience with tradies is they couldnt give the slightest stting fk about your stuff - on you for not moving your car/ telling them to bugger off and cut elsewehre.

Path of least resistance, onto the next mug.

Sorry im jaded with them TBH

[KAgantua]

PS I thought it was grinder residue on the grass... I thought fair play, gay dating apps and grass stains... ill get me coat

[hidetheelephants]

As above; acid will shift any remaining metal to prevent staining, depending on the size of the lump of metal it may need prolonged treatment. Not much you can do about the melty pit in the glass other than replace the whole glazing unit, not that expensive but still a pain in the arse and fiddly so you may want to get a glazier to do it. They definitely ought to be paying for it, it's not exactly secret that flying sparks can damage stuff they hit.