Hi Everyone. I've been renovating a Ransomes Marquis MK4 for some time (Wristpin you'll know this as you helped me with how to dismantle it 18 months ago!) and I am closing in on reassembling it having done a bare metal respray and cleaned every nut and bolt by hand! However, I have just realised that the inside of the petrol tank is very rusty and I certainly wouldn't want to be contaminating my sparkling carburettor with petrol from the inside of it...! Has anyone found a good way to remove rust and debris? Thanks. Mowermad.