to start a residents protest (more of a wwyd)

OK, we live in a 14 storey apartment block. Our windows are cleaned roughly 4 times a year. All inaccessible (to residents) are supposed to be cleaned, but they are not. Our management company organises this (and charges a hefty sum).

My bedroom windows have been cleaned, but not the balcony glass (inaccesible to clean by me). I complained and yesterday hey presto my balcony glass was cleaned. No one elses though.

I have just been chatting to residents in the lift. No one has had their balcony glass cleaned. They all pay the same service charges per year (roughly about £2,000 depending on the size of their apartment).

I was thinking of putting letters in peoples letter box asking if they had had their glass cleaned, then I would get onto the management company. Bearing in mind I spoke to the estate management yesterday and he just brushed me off (said all the balcony glass looked dirty because it was dirty inside the balcony).

So should I just stay quiet because mine has been cleaned, or stick my neck out (because I am a nosey cow, but people are paying for a service and not receiving it?)