Saddle Tank Cleaning

[Hedge]

I have read numerous post on here and THT regarding this issue. I have seen ways ranging from cutting a hole in the tank, using a match, to a shop vac, but nothing really seems smart, practical or useful to me. Is there a recommended way that will actually work?

First of all, I want to make sure they are actually good and don't leak, could they be filled with water to check this?