Donna.....first take a reference shot of a clear blue sky at f22
blow up to !00% and mark the worst spot locations with 'Paint'
then print - it helped me track down the visible spots
I recently bought all the kit and read lots ...then took
a week to pluck up courage to do it (first-timer)
1.....full battery - mirror lock-up - then Rocket Blower - with camera upside down
now I know its £45 for a loupe but it was, as I was told, damn INVALUABLE
i got one from here for £30..........I now dont see how I could manage without it
IF you pay postage BOTH ways you can borrow it - just drop me a PM
2...I then used a Sensor Clean pen - but only got the big visible dust
it helps side-light the dust if hubby holds an LED torch at 45deg into the mirror chamber
3,,, then used Sensor Clean green 16 swabs - only add a TINY bit of solution along the swab leading edge
4..quick as it evaporates fast
run the swab along each side of the anti-alias filter dont be afraid - use a firm sweep - the plastic handle will bend
if you use too much liquid you will recoil in horror at the streaks left - dont ask..
5...
another swab with
even less fluid will then remove the streaks....................
you only get 4 swabs with the kit - had to buy 2 kits(at £17each''
take heart...
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before

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after
good luck
no clouds in 2nd pic - i used a PC monitor screen set to pure white