Have your commercial sites got entrance ways or fire escapes ? if so they are probably the areas that look black or dark green and if this is the case when it rains these areas become a slip hazard almost ice like - basically an accident waiting to happen . Thankfully we have high flow and high pressure pressure washing equipment that can restore these areas back to a brighter and more importantly safer condition . As you can see from the photo just how badly areas can get ( this pic is part way through a clean just to show the difference ) We cover York and Yorkshire for pressure washing services from fire escapes to parking lots give us a call and get your site safe again .