As you know Nick not being of ''average'' hight (5' 7''/1.7m) if I stand on the rear door steps I can't reach the Sat Nav area of the roof ...So on the wheels for the roof and rear passenger roof section and front door steps for the front roof and this means I can reach to clean all the windscreen as well

The rear of the roof is dead easy for some - climb up the ladder fitted to the rear door
Then again if you are getting mud on the roof you HAVE been having fun. Tangiers Orange - gone, missing her
Replaced by Ewok what a mistake - now a happy Disco Sport owner

I stand on my towbar too Former Mod/Member, with the most post & Chicken George Arch nemesis

I use a plastic case/box that has originally been used to transport large bottles of soft drinks to/from the supermarket. Works a treat, high enough to reach the centre of the roof (just), dosent tip on an angled driveway, cant damage anything and didnt cost anything.

ps - maybe something like a milk bottle crate if you still have them in the UK  2007 Freelander 2 HSE TD4 Manual with Premium Pack & Moonroof.
Stornoway Grey with Ebony Black Pleather, Clear Indicators, Body Side Mouldings etc.

soft drinks..... You mean you buy beer in bulk Andy

I am 10-total, honest.  2007 Freelander 2 HSE TD4 Manual with Premium Pack & Moonroof.
Stornoway Grey with Ebony Black Pleather, Clear Indicators, Body Side Mouldings etc.

tie a piece of string over your driveway with chamois leathers hanging from it, every time you drive in/out the roof gets cleaned. also when you go for a walk you get a bald spot polish  At work
At home

"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

yep stand on the floor with the doors open or stand on the rear wheels

Open the sun roof and stand on the seats inside, not only can you clean the roof easily but you can also use the glass section to stand your cuppa on whilst your cleaning the roof and practice your pope role as well  I was only wrong once and thats when I thought I was but wasnt.

2010 Freelander 2 XS Stornaway Grey
2010 Aston DBS Morning Frost
2010 Bentley Continental Brooklands Green

My 4 year old can't fit through the opening on the sunroof  Former Mod/Member, with the most post & Chicken George Arch nemesis

Use one of these
 

I'm 6'8 so no longer need to use ladders either

I can almost do the whole roof from one side  Mine: 2012 Golf GTI Edition 35
Family's: 2009 Freelander 2 HSE TD4 Auto, Stornoway

Yorkshire - God's County

I climb up on roof "the garage roof". Flat roof with 3ft canopy nose against door and its nae bother.
Used this many times for motorhome. All FL2's (3) Gone
2011 Mercedes C180 CGI Gone
FL2 GS Auto SD with heated leather, factory tints, alloy spare and a few other bits.

I'm with AndyC - old milk or bottle crate is ideal - stable and strong

Probably get some stick from you know who but I use the large plastic step that was provided with the caravan. This is also very stable being wider at the base and has quite a large flat surface to stand on.