winter powerflush !

i was asked on my last powerflush job last week if most customers leave the flushing until winter time,,,well to be honest they do was my reply,,but  that realy is not the ideal time to flush the system,the last two winters have been terrible with many heating systems going down ,,if im going to give any good advice on this subject i woud say rather sooner than later ,apart from anything else when the weather is warmer generaly the system will be free and moving , i personaly woud not wait until it gets cold ,also start your system and run it up during summer ,think of it like a car ,if you dont start it up now and then it just wont want to start at all eventully !