This really annoys me when a national company take on contracts and does a really bad job,there is an Asda across from one of my commercial jobs,and it`s in a terrible state,it happened to me with Safeway when Morrisons took over and dumped me for a larger contractor and yes they are doing a bad job i used to get compliments all the time about my high standard of work and then i get dumped for someone whos more expensive and useless,so if you are saying that Asda may well want a better window cleaner then go for it,because after reading your post im going to have a word with the dirty hole that is ineed of some tlc,all the best with your quote,Gaz.