Date of cleaning trials : 08 / 03 / 21 – 10 / 03 / 21 Access : Mobile Elevated Work Platform ( MEWP ) Conditions : Dry and Overcast . Air temperature : 8-10 degrees .
Testing location : First level horizontal sandstone column on Walbrook St .
Surface pollutant type : Soft , flexible and stabilised .
Current surface coating : Lithofin MN Stain Stop .
Result guidance : Guidance and feedback was provided to help steer the level of finish .
Tested methods : Varying low-pressure steam with encased cleaning head and vacuum .
Completion : On completion of the testing , the locations were blended to remove evidence of testing .
Surface pollutants : Algae , carbon , oil / silicone bleeding & bird foul ( Sandbergs ).
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