Hi,
I have a 6”, 9” and 12”. I mostly use 9” squeegee. It is personal preference that matters here. My wife use only 6”. She says it is easy for her to carry and work. For proper window cleaning it is not size of the squeegee that matters. But how you use it. A squeegee works perfect when proper pressure is applied and moved in proper speed. If speed or pressure is wrong, window streaking can happen. To get best results, try more than one squeegees and find one that is most comfortable to use for you.
I have a 6”, 9” and 12”. I mostly use 9” squeegee. It is personal preference that matters here. My wife use only 6”. She says it is easy for her to carry and work. For proper window cleaning it is not size of the squeegee that matters. But how you use it. A squeegee works perfect when proper pressure is applied and moved in proper speed. If speed or pressure is wrong, window streaking can happen. To get best results, try more than one squeegees and find one that is most comfortable to use for you.