I hope nobody minds me mentioning this on your forum but I thought it may be useful.
It has taken years now to establish a reliable and professional laundering service for sails and covers, and at long last we (Northrop Sails, Ramsgate) have found a company that will collect and deliver to us.
Hope it may interest some of you.

Just had my cover cleaned by Northrop Sails.  Very fast and efficient service