The clock case must be free from dirt, grease etc. To ensure this, clean the case well with White Spirit. It is important that you dry the case well with clean cloths whilst the surface is still wet then leave for 2 – 3 hours before applying the Renovator. 

The Black Slate Renovator should be applied with a clean lint-free cloth wrapped over the forefinger and should be laid on the surface. DO NOT rub in but try to apply as evenly as possible. Small bubbles will level themselves out. 
Two coats are usual  but for very grey or white areas more may be necessary. 
Should any of the Renovator get onto inlay or marble parts it should be removed with a damp cloth before it dries. To remove any which is dry, use 0000 grade steel wool. When the clock is dry it can be buffed up to a high shine with a soft duster.
For further protection apply a light coat of wax polish.

Available in 2 sizes.  500ml and 250ml