It sounds liky you have, or will, contract to have this work done. I wouldn't worry too much about cleaning before-hand unless requested by the contractor.
The tub is going to be acid etched or solvent cleaned then sanded by the person doing the reglazing. The condition won't matter. The cabinets also will be sanded and prepared with solvent washes. It would be helpful if there was not a heavy grease layer. Again if you have contracted the work, it probably doesn't make any difference. The floor has to be cleaned to accept a mastic, but again, if you have already received a bid for installation, I would stick to sweeping and perhaps light mopping to remove "dirt", but the contractor should be able to handle surface prep.
If cleaning is important to the surface prep, you can be sure the contractor has a heavy duty power tool or machine that will make you do a dope slap for having worked so hard.