Hi Mark
Up until last week I'd have agreed with Barry. I used to be involved with a high street bank and cleaned 1 branch a day, sometimes 2. All through their own property division in Sheffield. Fortunately, I withdrew from this type of work, and thought that they all worked in this way. Then last week I spoke to someone ( a one man band) who still cleans for a few high street banks.
If the system is still the same for them all, by all means mailshot the branch, but also try the Area Office. Some of the smaller banks may not yet have a maintenance plan. I'm thinking of maybe the Irish, Pakistani etc. etc. It's worth a try.
Safe and happy cleaning:)
Ken