Has anyone used a private company to do a deep steam clean in a bathroom shower cubicle? No mould or discolouring of grout, but jus where the sliding doors overlap the runners at the bottom, it is very hard for us to get all the gunk build-up washed off. Shampoo, soap and (ironically) shower shine products all collect in the gully so I want to let loose with a proper high powered steam cleaner system to get it all off. Not a standard "end of tenancy clean" type company, but a really good (and fluent English speaking) company. Any recommendations?