It's best to wash and rinse the frames especially the tops and anything that can drip down onto the glass, First cleans I always clean frames vents and glass all round rinsing thoroughly, then go round again and just do the glass, that gives the vents or top frames time to stop dripping, second clean just a quick wipe with the water off will keep the vents reasonably clean, but always where possible clean the tops of the frame before the window below, make sure top openers are scrubbed and rinsed thoroughly also.
failing all that check your TDS at the brush head some hoses can raise your tds overnight.