Owain wrote:

Coldtoes wrote:

See Andy Hall's postings on this subject [1] and when he warns that
radiator sludge is indelible on carpets he means it :-)

I don't disagree about radiator sludge on carpets, but in a previous
existence, I accidentally emptied out the black dregs of a radiator onto
the middle of a white carpet. The rapid application of some gallons of
warm water and a wet and dry vac did actually remove the stain, to the
point where she didn't notice.

Regards
Capitol