[OldRestorer]

If at all possible with the Rexine or leatherette I just use warm soapy water on a cloth with firm pressure but on heavily soiled cases the need of a cream cleaner can be useful. Various polishes can be used when the case has been cleaned to bring back a nice lustre or shine including standard furniture polishes, liquid beeswax used sparingly or car interior cream polishes. A small hand brush and old toothbrush can often be useful with Fairy Liquid or cream cleaner to get stubborn stains off. Although the Rexine or leatherette covers on the wood case are well stuck on caution is needed not to get too wet while cleaning as lifting can occur specially at the edges, it is fairly common to see some lifting of the edges due to the original adhesive drying out but with care these can be stuck back down.