Matthew 7:6 "Don't give that which is holy to the dogs, neither throw your pearls before the pigs"
Because of videos like that correct information fall into deaf ears, we all know how this goes, "my friend said", "the video show", etc, etc.
What happens is this, the drum (top and bottom) get contaminated by tape residues, air pollution, tobacco "gunk" from cigarette smoke among other things. When you clean/decontaminate the drum you make the surface smooth, the tape can have 100% contact with the surface again and the heads can read a clean signal from the tape. This is what this Youtube videos show, it has nothing to do with dirty heads.
It's OK to use paper to clean the drum, but it's not OK to use it to clean the heads, when you use paper to clean the heads what you see on the paper it's not dirt but removed head materials. Maybe it doesn't cause any harm with VHS heads, but it can do some damage with 8mm/HI8/DV heads.
Depending on how much pressure you use it, only a professional can tell what is wrong.
It might look easy but it's not, it requires some skills to handle it.
The video show the guy decontaminating the DRUM, it doesn't mean the heads are dirty.
This is the problem, people do this things but they doesn't understand why they are doing it, they "believe" they are cleaning the heads but in fact they are decontaminating the drums. The dirt on the paper is not dirt, it's head material.
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