how to get rid of lichen and moss please help!

[Meggymoo]

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Power washer. Get a special jet attachment for hosepipe or better still hire a proper power washer for the day.

Here for example. Can't link direct, so put power washer in search box and then click mini washer.

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Can do porch roof if you can get safely up a ladder and do from above, so jet is spraying in the direction of the tiles. Of try getting a chemical moss and lichen remover to use on the roof tiles, but you would still need to rinse off with hosepipe afterwards. Use a long handle yard brush with tough bristles to scrub.

Is a power washer any good for decking?

As long as it isn't going to drain away onto a lawn or flowerbeds, swill down with a solution of bleach.

Our patio is below the level of our lawn, so we swill and sweep with bleach twice a year. It kills the weeds between the slabs too!

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