Thanks guys!
So once flushed I was going to rinse with isopropyl alcohol to get any water out then fill with premix. Do I need to use Inox before the fuel? How does this go with the fuel - no effects on running?

Hi all

I have recently bought a '76 TY175 that is a complete rough-runner but the main issue is that the fuel tank is very rusty internally.
It had been sitting in a guys shed for a while but still started easily.

Any recommendations on best way to clean the inside? I have got most of the loose ...