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Cleaning Exterior Stone Surfaces - Methods & Products

  cleaning and removing moss from stone

 To remove dirt and grime from Exterior Stone, we suggest using the following process:

 (For heavy moss and Mildew, we suggest spraying first with R160


1. Mix a solution of 1-part R155 Intensive Cleaner to 6-parts clean water in a bucket.

2. Using a stiff natural bristle scrub brush, dip brush in cleaning solution and apply to dirty stone and scrub area for 1 minute.

3. Allow to dwell on surface for 10 minutes to activate cleaning action (do not allow to dry), apply more cleaning solution of needed.

4. Scrub area again aggressively for 3-5 minutes.

5. Thoroughly rinse area with clean water.

6. Allow area to dry.


If deeply penetrated stains remain, repeat process but allow solution to dwell for 15 minutes.Rinse very well with clean water. Allow to dry.


To Protect Natural Stone from dirt, grease, and other contaminants, use a professional quality stone Impregnator.


Cleaning Exterior Stone with HMK Stone Care Products

HMK makes a full line of Professional Grade products specifically designed for Natural Stone


Moss & Mildew               R160 Moss & Mildew Remover

Efflorescence                 R165 Terra Cotta Cleaner - Cleans all stone surfaces (Special Order Only) Please Call - Acid Base

Leaf Decay                     R160 Moss & Mildew Remover 

Tire Marks                      R155 Intensive Cleaner 

Grease                            R155 Intensive Cleaner

Grout Residue                R155 Intensive Cleaner for Mild Residue.

For Heavy Cement or Grout Residue use R163 (Special Order) Please Call 

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or Call 800-380-6881