You can use on -
Tile, Grout and concrete. 

You can Not use on -
Painted Surfaces(some metal frames or fixtures are painted and it can remove the finish),
Stone(will remove the sheen or polish and will etch or damage the stone the longer you allow to dwell)

PPE -
Goggles or face mask, respirator in ventilated area, gloves and arm protection.  

Precautions -
Keep out of reach of children and animals. 
If Inhaled -
Poison avoid breathing fumes, vapors can be extremely hazardous. 
(Move to fresh air, if experiencing trouble breathing call 911, otherwise call poison control center). 
If in Eyes -
Avoid contact with eyes, clothing and skin, may cause inching burning.
(Immediately flush skin and eyes with water for at least 15 minutes.)
If Swallowed -
Do not drop or strike containers.
(Call a poison control center immediately, sip a glass of water if able to swallow and do not induce vomiting unless told to do so by poison control center).  

Instructions -
Ready to use formula, no mixing necessary. The top of the lid can pop to allow for easy output. First scrape excess buildup with grout triangle and razor scrapper. Squeeze out as needed and let dwell for 10 minutes, you can reapply in needed areas. Rinse well with water and vacuum. T.G.C should be used next to neutralize the surface and clean the tile & grout.

For showers, make sure to remove build up in drain and vacuum well. Then Apply E.C.R to the perimeter, entire floor area and allow to dwell. Rinse well, vacuum and apply T.G.C.  

Price -
Contact for pricing.