Are you sure you're actually cleaning the heads, not just polishing
the drum? Again, if you don't know what you're doing, don't do
anything. A professional clean is cheaper than new heads.

I don't know. That's why I included all those details. Are the heads
180 deg apart in the middle of the drum? There are only two "holes" in
the drum, and it's supposed to be a 4-head VCR.