All excited about my new system and new venture but a slight kick in the nuts at my first complaint! Semi detached house! Upvc windows, moss over the sills,cobwebs, and random stains on the glass on upper level! I scrubbed until I started to think the stain had to be on the inside as it wasn't budging! Anyway Ive learnt my lesson straight from the begining to spend extra time on those first cleans!