Hard water removal included?

So we've been cleaning windows for about 5 years now going well. I always feel a bit uneasy about leaving hard water stains on glass even if the customer is having a general clean. My question is do you guys include hard water removal on general cleans or do you let the customer know that it's not included/included? I don't see us including it in a general clean without charging for it. But I also don't let customers know it's not coming out with the general cleaning . I just never address it but I've had to defend our service a few times lately.





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