hello, dont know if u stil need to know the answer to this. but I wil anyway for others

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I have used so many different things, spent hundreds on them

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For quickness, use the auto glym vinyl and rubber care, spray it on a micro fibre cloth pad, then wipe.
For best results, meguiars have a vinyl clean and protect (exact name forgot, its in a blue bottle in halfords) - Spray this on a micro fibre cloth, then wipe on. What you will notice is that this is quite an oily liquid. So you will have to wipe it off with a clean pad.
If you dont want to buff, I wet a synthetic chamois and drain it out. then rub it all over the interiors after applying the meguiars. this removes the oily residue and makes the dash look so sweet.
Also, you dont need to re apply after, just reactivate it by putting a little water in a bucket, spray a few sprays of meguiars. Soak ur chamois in this, and squeeze out residue, rub this all over and hey presto, clean dash in 30 seconds! -
PS, chamois is great for removing dust as well, and does not leave any marks or streaks. like normal pads do.