Central Heating Flush

[Aprisa]

We've just had a new boiler fitted by a complete cowboy.

System now sorted and certified (by another) but some rad's are obviously partially blocked with sludge.

Question is:- can I realistically flush the system myself by adding the chemicals to the tank (after draining) leaving it running a while and then draining down through the valve at the bottom of the system? or do I need to get a professional with the "Power Flush" kit?

Thanks
Nick

[Aprisa]

Ok, I'll give it go, £300 sounded a bit steep to me anyway!
Thanks Chaps
Nick