The house we are renting has an MTI whirlpool tub. The first time I used it, one jet didn't expel anything and I couldn't turn the nozzle. Now, there are 3 of the 6 jets not working for some unknown reason. Being a renter, I have no idea how often it was used before or what was used in it. Do I need to disassemble the jets to attempt to clean them? I hope not, as I've never done that before. Will the commercially available cleaners do the job? I don't want to use bleach as the bathroom is not well ventilated. Thank you for any help you may give.