There probably is some danger to it, especially if not taking care.
I was using it for like a year or two and never had an issue, keep it wet.
I've been using caustic TFR all day today 2-1 "0" problems.
Spray the brush, go up and jet the windows and frames till soaked, scrub it in good. Super scrape the glass while its sitting then scrub and rinse till gone.