one shot drain cleaner - de-rusting

[Jamie]

See

Alan, that's a whole hundred pounds! Comment from missis "Not more money on those damn cars!" I am one of those "impecunious enthusiasts". Cost me next to nowt only my time and means I am not watching various rubbish on tv.
Cheers,
Dave.
PS Different situation if you are working and have cash available.

Parazine and Bob, 
    what ratio of washing soda to water do you use?

I am doing this at the moment and using two kettles full of water and a small handful size amount of soda. It is working well.

Jamie.

[Bob Olive]

Jamie
I reckon about one tablespoon of soda to one gallon, it's not that critical - but worth noting that 'increasing the dose' as it were, won't make things happen any faster or better. If you want to PM me, I'll send you my notes on it.

[Bob Olive]

Robert
About one tablespoon of soda to one gallon of water - it's not critical. It is with noting too, that adding more soda (or less water) won't speed up or improve the process. If you PM me I'll send a copy of my notes on this.

[friendzone]

i usually use cars brake fluid (oil) to de-rust . its rather useful

[Parazine]

Parazine and Bob, 
    what ratio of washing soda to water do you use?

My bath is a large plastic trug thingy from a garden centre. It takes about 8 gallons to fill it (that's about 36 litres for all you metrificated guys) and about half a packet of soda crystals (the small (500g?) size). I don't think the ratio is critical, it's there to make the water into a good conductor.