How to clean fuel tank?

[Soundguy]

Make sure the tanks don't cross leak past the baffle..

Soundguy

 

[Egon]

Pickle it.

 

[LBrown59]

Make sure the tanks don't cross leak past the baffle..

Soundguy

The only time I'd trust a tank like this is when both sides had the same stuff in them.

 

[WilliamBos]

How about filling it with TSP & Water and letting it soak? This is what someone told me to do. Has anyone tried this??