lemon tree with sooty mould

hi
our lemon tree is virtually covered with sooty mould
yes I know what causes it plus it was pretty stressed last year,so that didnt help ,
it is a good bearer and we have cut it back quite a few times as its about 8 foot tall again so will need to be done again soon , last time we cut it back we cut at least 3-4 feet off it

so if I spray it will it make the lemons unuseable , or should I pick what I need first
then cut it back hard "again"

it is loaded with fruit , its like a machine it just never stops and I try to give as much away as I can

white oil is best to use for scale ,sooty mould etc isnt it
also does anyone have a home made recipe for it
thanks in advance

To 500 ml water add 2 tbsp canola or sunflower oil and 4 drops dishwashing liquid. Pour into a spray bottle. Shake before using. This is a really cheap white oil. I have even used up used oil this way. The dishwashing liquid makes it stick to the leaves until the rain w3ashes it off. Be sure to spray the whole tree!

hi blossom thankyou so very much
well you know what I will be doing this weekend if no rain dont you
another question should I pick all the fruit off ,first do you think
again thankyou