If you want to make your tubs like new you can get the TOUGH AS TILE here!
TOUGH AS TILE https://amzn.to/2VXUG3O​
MIRACLE HEAVY DUTY CLEANER https://amzn.to/39lrtHa

Product description:
Homax® Tough as Tile® Tub & Sink Refinishing Kit provides everything you need to restore your tub, sink or tile to a likenew condition. It is specially formulated to provide a durable, glossy and protective finish that remains beautiful for years. No need to hire a contractor or replace expensive fixtures. Homax Tough as Tile works on ceramic, porcelain, fiberglass, acrylic, laminate, china and enamelcoated steel.

Why Choose Homax Tough as Tile Spray–On Tub, Bathroom Sink, and Tile Refinishing Kit​?
Provides a hard, protective finish that remains beautiful over time.
Convenient sprayon application.
Onepart, no mixing required.
Selfleveling finish leaves a smooth, porcelainlike surface.
Advanced technology, superior adhesion.
Economical alternative to tub, bathroom sink or tile replacement.
White.
Covers one (1) standard tub or two (2) bathroom sinks.

Kit Includes:
(2) 16 oz. (454 g) Tough as Tile® Finish Cans.
(2) Pads of Homax® Extra Fine Steel Wool.
(1) Packet 1 oz. (28 g) Surface Preparation Cleaner.
(1) Pair of Nitrile Gloves.

Supplies Needed:
Plastic Drop Cloth.
Painters Masking Tape.
Homax® Porcelain Chip Fix(if repair of chips or cracks is needed).
Bucket.
Cleaning Sponge.
Paper Towels.
Lacquer Thinner.
Respirator (NIOSH Approved Organic Vapor).
Protective Eyewear.