Put down an new piece of bathtub trim and/or caulk well.

Lol, yeah, and bathtub gin...

Unless you crack the shell, there is never a good reason to replace a hot tub with a new one, as they are quite easy - and cheap - to repair.A hot tub that has been sat in is no different than a previously-sat-on toilet, indoor bathtub, shower, sinks, or refrigerator. 

I have a smaller job for (7.5 K) for installing a new walk in shower and bathtub-shower with new tile, etc. 

Maintenance / SafetyAdd carbon monoxide and smoke detectors to 1stand 2nd floor (42) Remove old detectorsInstall gutter downspouts to prevent moisture intrusion (126) Reinstall vapor barrier in crawl space (127) Replace insulation within wall by the bathtub (106)§ To be discussed when wall is openedPine PanelingInstall 1x6 T&G Pine Paneling Everywhere that vertical paneling is currently installed.

I have few rentals with bathtubs as old as property - 50 years old or so.

(plumbing fixtures were replaced)Bathroom- Repair or replace all bathroom toilets, sinks, tile, vanity, shower heads and bathtub (plumbing fixtures were replaced)Dumpster- To haul away debrisHardware Package- Replace all door knobs, blinds, A/C vent covers, light fixtures, and receptaclesFinal Clean- Deep interior clean to get property camera ready for professional final rental listing photos

And they have reported a slow clog in their bathtub, the thing is they offered to hire a plumber and pay for it themselves.Ive never heard of anyone doing this, and was wondering if it is legal or what are my risks by allowing this? 

The waste and overflow of her bathtub cracked and was leaking water downstairs every time she would shower!

NEW kitchen with NEW white Shaker cabinets AND quartz countertops, NEW wood laminate flooring, UPDATED bathrooms with NEW matching white Shaker cabinets, NEW plumbing, NEW bathtub, shower and tiled floors, All NEW drywall, NEW electrical panel, NEW electrical wiring, NEW siding, NEW windows, NEW roof, FRESH landscaping front side and back. ...