.... you want to reinvent the wheel like those studios never existed and those maintenance engineers never used these products. And you're basing that on what?
Nope...no "wheel reinvention" at all.
Anhydrous Isopropyl has been one of the most recommended 1st choice cleaners for tape heads/transport in just about every piece of info I've ever seen or tape deck manuals I've read in the last 30 years, not to mention, gotten from direct communication with manufacturers like TASCAM and Fostex when thy still use to make tape decks.
As I already mentioned (as evidence), many of these prosumer level decks do have plastic components in and around the head/transport area.
Acetone/Ketone is found in quantities of 10% or possibly more in some denatured alcohol blends. (more evidence)
I provided a copy of the MSDS sheet for the denatured alcohol that you found at Lowe's....and that stuff HAS it. (more evidence)
There are many "blends" of denatured alcohol, and the content in denatured alcohol is not comprised of a single chemical, like isopropyl alcohol is, so unless you know what's in your batch of denatured alcohol, and what potential damage any one of those chemicals may cause on certain surfaces, yes, there is a risk in using them.....but the bigger risk comes from NOT knowing what you are using, which is what you are so casually and insistently willing to dismiss here, that knowing is not important, just 'cuz "back in the day" you used it on everything without issues.
Who knows what blend of chemicals here in the stuff you used and what is in the variety of denatured alcohol blends that can be found in various outlets. All I've been saying is that it's safer to go with 90+% isopropyl, and much safer to simply avoid the denatured alcohol, unless you want to take the time to read the MSDS sheets and/or the back of the cans and decide if the chemical blend is "safe" or not. You just want everyone to assume that ALL denatured alcohol blends are safe on every/any tape deck head/transport surface....which is rather haphazard, IMO.
I may be over-cautious, but hey, I don't want to ruin something on my tape deck by treating it with some chemical blend that has the potential to melt/dissolve certain plastics.....you on the other hand want to ignore any caution, which is your choice, but why pass that mindset on to others here?
You are obviously familiar with the variety of harsh chemicals that can be used for deck maintenanc, that must be used with some caution...but not everyone here will have that experience....so better safe than sorry.
AFA more "evidence"....ahhh, just look up acetone and you will see that it's clearly stated in the technical info that it CAN MELT CERTAIN TYPES OF PLASTICS.
What other info do you need????
<EDIT>
Here's some more "evidence"....read the whole thread, but read post #5.
http://www.audiokarma.org/forums/showthread.php?t=157367
I know that denatured alcohol may only have 10% or so acetone/ketone additives....but tell me, do you really want to take the chance of have that happen to your tape heads like that guy in post #5....or just stick with isopropyl and not risk it?
Oh...and read post #14 if you want some "back in the day" info.
