Well, the thermostat stops it from getting hotter than 94 at the substrate level, but at the glass it is too hot to the touch. Few seconds of contact will start burning. I put the probe on it. I'll get an accurate temp in few seconds.

I don't really have a way to rinse the tank right now, so what would you recommend me to do? It's not really that dirty, there are few dried water spots here and there but thats about it. So you're saying the leftover residues is what will be dangerous?