Has anyone used a ' bore scope ' type tool to inspect the in-tank filter?

What are the negatives in using one to check for severity of blockage?

I had algae in a dump truck's fuel tank. Tried having it cleaned at a shop, tried a 4000 psi power washer with adjustable tip, nothing would remove the ' silicone glue ' type residue. Finally decided to build a wood fire and after cooking all sides, the thick coating was cooked away and left a stain that the heat wouldn't cook off. Repainted tank and no more trouble while I owned it.