Is a steroid going to clean the wound? Best bet is to get it clean and keep it clean. Use a newspaper or paper towel substrate, make sure it's enclosure and everything in it is immaculate. To be honest, other than the wound and maybe being a bit dehydrated or in sort of a perma-stuck shed, it doesn't look that bad. Probably could use a bump in humidity and/or a good soaking, but the tricky part is that moisture is counter productive when it comes to open wounds...do what you can, but I'd definitely get on finding that vet.