When I went to purchase some intensive washer fluid today I was advised that this is a discontinued product but I managed to buy a litre on ebay.
I asked the dealer to explain what BMW's recommendation is for overcoming this situation with vehicles that previously used intensive cleaner and was told to just use undiluted ordinary screen wash.
I suppose there was no other answer but it does kind of make a joke of all the years we have paid through the nose for intensive cleaner when the advise was "only use BMW intensive cleaner"