On Thu, 10 Jan 2019 08:07:13 -0000 (UTC), gregz
wrote:

Heads have some insulating material imbedded. Real rubbing alcohol is
supposed to have oil to prevent skin drying too much. Most don't. Isopropyl
or ethyl cleans heads.
Greg

Perhaps it would be interesting to see what's in a commercial tape
head cleaner?

GC Electronics Magnetic Head Cleaner
Kinda looks like alcohol (ethanol) is safe.
http://www.gcelectronics.com/order/msds/116.pdf
Ethanol 86.8%
Methanol 4.5%
Acetic Acid Ethyl Ester 1.1%
2-Pentanone, 4-Methyl- 1.0%
Solvent Naphtha 0.4%
(Petroleum), Light Aliph.
Hexane 0.4%
2-Propanol,2-Methyl- 0.11%
Benzene, Methy- 0.05%
Cyclohexane 0.001%
Other 5.7%

MG Chemicals 407c Audio/video head cleaner
https://www.mgchemicals.com/products/cleaning-products-for-electronics/cleaners/specialty-cleaners/audiovideo-head-cleaner-407c
It says "Safe on Plastics".
The composition is somewhat different from the GC head cleaner.
https://www.mgchemicals.com/downloads/msds/01%20English%20Can-USA%20SDS/sds-407c-l.pdf
67-63-0 propan-2-ol (IPA) 50%
107-83-5 methyl-2-pentane 15-25%
96-14-0 methyl-3-pentane 5-10%
79-29-8 dimethyl-2,3-butane 5-10%
75-83-2 dimethyl-2,2-butane 3-7%
110-54-3 n-hexane 1-2%

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558