I'm cycling very regularly now, and can't afford the luxury of a 'winter bike.' Yet it's amazing just how much crud comes off the road, and how much it gets in every nook and cranny on the bike. People often advertise expensive bikes saying dry miles only, and I can really see why they would do that.
This kit is a great help though, and goes a long way to restoring the bike's looks. I find it best to clean it soon after getting home. if you leave the dirt to dry on it becomes much more difficult.
A couple of warnings- firstly be sure and wash the brushes thoroughly. They can do a good job of getting oil-based dirt off the bike, but it then sticks to the brush and next time you wash the bike you spread it back on again. I wash them several times with hot water and detergent.
Secondly don't keep the whole kit in the bucket with the lid closed. I did this, and noticed the aerosol bike spray was getting rusty, but then found the can empty one day and all the spray in the bottom of the bucket. The can had rusted right through!
Apart from that it really does the job, and is one of the most useful things you'll get to maintain your bike.