I sorted my problem of the residue by changing my cleaning fluid and rinse. I now use 'Fine Clean' and 'Fine Rinse' by a company called 'Quadralene' https://quadralene.com/
They don't advertise it and you can't buy it directly from their website, you have to call them. The great thing is you get 5 litre containers, instead of 3.8 litres that L & R sell and it is a lot cheaper. I think it works out about £70 with delivery, whereas L & R fluids will cost over £100 and you get 20% less fluid. No brainer!
It's non ammoniated, but works a dream
Keep in mind this movement is in the "very thin" category, everything about it is delicate (the balance pivots are a hair under 0.06mm, no shock protection). You can see the size of the canon pinion in the photo, that's a 1mm screwdriver blade for comparison.