I had the tape head cleaner optimized since 1997. Until recently, my distributors weren't interested in the product. I've had a handful of very well known studios that have used it since 1998. Not just a one time sample, but re-orders since then, too. Three of those studios have 800 series Studer 2 ninch decks, one studio has a slaved pair of 827 24 tracks. One of the other studios has a minty fresh Stephens and another a 2" 3M with a copper headstack.
So yes, it will be safe to use on your A810.