I had occasion to remove one of our radiators and noticed that a fair bit of black water came out. After taking the rad outside and reverse flushing it, it soon became apparent that the rad was pretty clogged up with sludge as it took a lot of faffing about to get the water to flow smoothly and freely.  All the rads are Acova Strianes - the ones with the thin tubes.  So I'm wondering whether or not I should remove all my radiators and give them the same treatment? Trouble is some are in carpetted rooms....

Or would a good sludge remover do the same job?  And how would I know it had worked?

TIA.

it's usually just the lowest radiators that collect all the sludge. Sludge remover does the trick, but I find it best if the system is run hot with the sludge remover for a few days before draining it out. If it's really bad, repeat the procedure.

I like your Henry

If you run a hose through each rad, you can tap the bottoms with a rubber mallet, don't go too mad or you could pinhole them, the same reason I would leave the chemicals in the box.

Old rads don't like too much abuse.