Woeps. I meanth the heads indeed and didn't mention the rubbers. Changed that in my prev reaction.
How can people answer any of these questions with no knowledge of the product at all?
I have the Teac pink and blue or green rubber cleaners. NO they do not go bad.
The Pink solution was similar to if not exactly dry cleaning solution. It evaporates very quickly and we at Teac Factory Service in Chicago used Denatured alcohol when they learned that it worked just as well and did not have the O zone depleting nature of the pink hydrocarbon.
I seem to remember that the name was Trichlorotriflouroethane.
The blue color solution was made by Rawn in Wisconsin. It is 97% Naphtha which is what I use from the paint or hardware store myself. The blue color is photo reactive and if left in the sun it will turn green. That is the only change that will take place but the color is just there for looks.
The chemicals work the same right down to the last drop.
Now as to using Isopropyl alcohol. It does no good to use that on tape heads or rubber. It does not have the ability to dissolve oxides and the binders used with them. It is like using water on such products in that all you get off is from friction not the chemical.
Denatured alcohol is cheaper and does the job well and I have been using it for 45 years so far. It can be used on rubber for cleaning and in 45 years I have yet to see a pinch roller crack due to the use- most all these alcohol warnings are from people that repeat stories with no basis in fact.
So the stuff you paid a lot of money for like S721 is all a ridiculous profit making product for those who sell them. They are of no real use by the people that know what they are doing.
Denatured Alcohol for about $12 a gallon at Home Depot and Naphtha as well will get all the stuff you need to service tape deck.
On occasion I use Nu Finish Car polish for heads to polish off corrosion but it also leaves a surfactant that make for better tape to head contact.
I have proof of this as I have seen variations of audio level be cut in half just by the treatment of the nu Finish polish from the orange bottle.
The only place I use Isopropyl alcohol is on cuts or to clean PCB's after denatured. That is it. Rubbing alcohol from a medical store is all full of water perfumes and other junk. No one should be using any form of that stuff. It comes out of cheapness and stupidity that it is bought.
I said medical alcohol. That mostly is denatured alcohol.
I love how all of you experts think you know more that a trained TEAC service technician with 45 years of experience.
... 99% denatured alcohol-which is a solvent as opposed to iso.which is a disinfectant...
TEAC's head cleaner back in the day was trichlorotrifluoroethane. Not the most healthiest of solvents, that's long been outlawed.
mild dishsoap on rubber. It's worked for me forever with no harm so why do something else.
Can you define "mild"?
You'd be amazed at the stuff that's in dishwasher fluids and powders for machines, fi. Since you're not supposed to put your hands in the machine, they can be quite dangerous, especially the industrial kind....
Tri is one of the LEAST toxic solvents. It's outlawed as one of the gases that eats the ozone layer. And even that is only for large scale, industrial uses. It's still available in small quantities, but it's no longer used as a refrigerant. It used to be a common household cleaner.
You seem to confuse it with MEK, which is an entirely different thing.
We use tri to clean medical machines, amongst other stuff. Use gloves if you use it for longer than a simple tape head cleaning. Work in a ventilated area so you don't inhale a lot of it. And don't drink the stuff, evidently.
There are NO healthy solvents, except water. And even water can kill