Cleaning lichen off patio

[Squid Vicious]

Any suggestions on how to remove lichen from the patio (the moss I can easily remove with a bit good old fashioned elbow grease)



I've tried one chemical product which was supposed to kill lichen but it seemed to have little to no effect. Any other chemical products you know that work?

Would a 130 bar pressure washer be powerful enough to clean things up? (looking at the titan brand thing from screwfix)

 

[Squid Vicious]

Thanks for the tips guys - will wait until weather improves and get some bleach onto it.

 

[Squid Vicious]

I picked up the pressure washer and was giving it a little test this weekend (no chems involved yet) and it does it a great job of cleaning all the muck, moss and lichen off BUT.... the flow rate or pressure from the outside tap is a little lacking - I've tried connecting with both standard garden pipe and a 'magic' hose (kink-free extending thing - great for watering the veg) but the end result is high pressure for 30-45 seconds before it drops off and I need to wait for similar amount of time before I can blast off another couple of bricks.

Options...
1) Call out the plumber and see if they can do some magic with the outside tap (flow does seem to lack in comparison with the indoor taps)
2) Connect the hose to the mixer tap in the kitchen using any one of a number of connector devices but risk a soggy kitchen should it slip or otherwise leak - though have noticed that there's an aerator that screws in so could provide a secure method for securing a connector
3) Looking under the sink I can see that the hose for the washing machine connects to what appears to be 1" male connector with valve

 

[Squid Vicious]

I picked up a hozelock 2304 9000 with adaptor for 22mm external thread - goes onto the kitchen tap nicely and now I have sufficient flow to keep the pressure washer going at full power.

Just need to wait for some decent weather now... and some fine sand to replace the stuff that gets blasted out from the between the blocks.