i started steam cleaning then came across this article on positive feedback. should it be of concern? reproducing the relevant para, note the last line.
Record Chemistry
So while the choice of record inner sleeve profoundly affects the record surface, cleanliness and playback quality, the biggest barrier to maintaining a clean album and extending its useful pop and tick-free lifetime is the record chemistry itself. A primary static charge is created the moment the record surface separates from mold surface. Briefly, records are a complex chemical mixture including 85% polyvinyl chloride (PVC), 15% polyvinyl acetate (PVA), antistatic agents, dyes, stabilizers (heavy metals such as lead stearate), modifiers and lubricants. PVA, the exact chemistry of which varies among companies, both aids in the flow of vinyl during record pressing and as a plasticizer. Plasticizers play a critical role in softening the plastic/resin. Under normal conditions, stabilizers, of which there are enough to last for decades, act to consume HCl. (One fact that many those who want to steam clean their LPs seems to ignore, is that heat and UV degrade PVC; heat causes the release of HCl.)