I had used a pressure washer owned by a neighbour and, impressed by how well it cleaned up stains on tarmac with very little effort, I decided to get one for myself. I chose this Karcher product for the name and the many attachments that are supplied in the pack.
The first thing I noticed about this pressure washer is that it is not hugely powerful (my neighbour's produced a much more powerful jet of water). However, this is good enough to do the things that I want to do although I found that the patio attachment did not perform well (pressure too low to achieve anything).
I mostly use the lance attachment and this produces a jet of water that is powerful enough to remove fence protector over-spill from patio slabs/garden ornaments/tarmac, ground in dirt and it also did rather well when it came to removing an oil spill from the drive.
The cleaning tablets are, in my opinion, an unnecessary expense. Most tasks can be completed using just water and, where something extra is needed, I have found a squirt of washing up liquid directly on the area to be cleaned works just as well.
There are more powerful pressure washers available and they will do the job faster. This is, however a reasonably priced model that will get most jobs done even if it takes a little longer.