The publishers of the
Maidenhead Advertiser and
Windsor Express are making their archive available online. It is a subscription service - options include single edition, seven-days, monthly or annual. There is no obligation to subscribe before you search for what you are looking for.
The Advertiser editions begin in 1870, while the Windsor Express editions begin in 1812. There are some gaps in the Express editions.
Check out what is available and a sample browse at this link:
https://www.baylismediaarchive.co.uk/custompages/Baylis/Home.aspx
