Remove mortar and veil from stones

When removing mortar that has landed on stones, it depends on the type of stone. Open-pore and unsealed surfaces are sensitive to conventional acidic cleaners. For some natural rocks, no acidic agents may be used at all. This is where mechanical methods help.

Determine sensitivity

Often it is unavoidable that mortar sticks to stone surfaces or forms a veil. Often stones do not tolerate the conventional detergents for limescale and cement haze removal. While some natural rocks allow careful dabbing techniques, other sensitive surfaces can only use mechanical methods.

Acid resistant are all sealed tiles. Ceramic and glazed surfaces can be treated with cleaning agents. When grout from removing tiles and when removing the veil and streaks can also serve home remedies such as vinegar, lemon or cola.

Resistant natural rocks

As acid resistant gneisses, granites and slates are called. With them you can also work with mild acids with care. Please note:

  • The action of the cleaning agents must be limited to short periods
  • Each spotting should be followed by thorough and timely rinsing
  • For drying strongly absorbent cloths and cloths are recommended
  • Coarser mortar residues should be removed mechanically

Sensitive natural rocks

Limestone, marble and sandstone are very sensitive to acid. For soiling, only mechanical methods such as polishing and grinding should be used. As an aid, the following means and tools can be used:

  • polishing pad
  • to brush
  • abrasive pastes
  • neutral soaps
  • stones oil
  • Acetone (after compatibility test)

The same applies to the removal of grout on rough tiles. In general, mechanical procedures protect every stone from substantial damage. Coarse mortar residues can be lifted off with spatula and trowel.

Prevention by covering and masking

The more sensitive the stone is to be grouted, the more worthwhile are the more extensive protective measures. Masking foils and the masking of the stone surfaces at the edges of the joints, similar to brushing the paints, can keep the mortar away from the stones.

Tips & Tricks

A large part of your cleaning success and above all the visible result has a slow and often repeated procedure. Many minimally invasive procedures reduce the risk of attacking the stone substance.

Artikelbild: Miriam Doerr Martin Frommherz / Shutterstock

Video Board: How to Remove Grout and Cement Residues