It dissolves very quickly Markus. It doesn't stain either hard floors or carpets. It's very safe but on polished wooden floors only spray for around 30 seconds as it can get slippy after that. Other than that it is very safe. Hope that helps.
Hello. I use it indoors every weekend in venues with wooden polished floors with no problem. I use it in bursts of around 30 seconds. Anything longer and the floor can become slippy. Hope that helps. Peter