I find the secret if you don't have the facility to wash the Mog on holiday is hose over to get the abrasive dust off and then soak old worn microfibre cloths and leave these on the worst effected areas and be patient whilst things soften
After you think it's clean, wrap some cling film around your finger and test the surface, if you still feel 'bits' then clay bar will sort it, followed by a quick re-wax of that area
