Fast-acting and powerful foam spray formulated to cut through calcium, lime and hard water deposits, soap scum, dulling film and dirt. Ideal for: ceramic tile, shower doors, sinks, bathtubs, grout and caulk, toilet bowls, fiberglass, shower head fixtures, and kitchen counter tops. Contains no phosphates, ammonia or bleach. Easy-to-use - just rinse thoroughly with clean cold water after 2-3 minutes

Use gloves and keep the room well ventilated as the smell can be overwhelming.
It does a good job of clearing calcium and lime in areas you need to spray to get too like around upper toilet bowl ring or faucet spout areas.

Really great product.