The fast and easy way to clean sandstone is with
HD Acid. 2:1 to 3:1. Brushed on a prewet surface and pressure
rinsed off. The best way to clean sandstone is to prewet and
apply Stripper Cream. Allow a 24 hour-soak and then pressure
rinse with 2000 PSI to 3000 PSI with a 25° to 40° nozzle. It
is a bad idea to get into the face of the stone with the pressure
washer as this usually creates an orange stain on the face of
the newly uncovered stone.
Cleaning stone with a caustic leaves
an excellent stone appearance that is completely natural and
very attractive. It is also time consuming and more expensive.An
acid neutralization may be needed and for that we recommend
cut GSR. Dilutions will be determined by testing. For restoration
and preservation this is the best. Recently we have seen several
examples of an alternative cleaning process for Cleveland Sandstone,
which had a tendency to turn orange in the restoration process.
An initial application of SafeRestore
followed in a double soap system by GSR will clean the stone
but not create the orange stains. If orange stains are created
a strong phosphoric acid solution like Concrete Truck Cleaner
applied after prewetting and given plenty of dwell time before
garden hose rinsing will reduce the staining.
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