If you have used Cquartz before you know they give you these ridiculous cotton squares and all they do is soak up the material.
The 30ml for $49 gives you these only.
The 30ml $59 kit gives you an applicator pad and a micro suede cloth. That is the best way to apply it!
My blue applicator's foam started coming off after repeated use. I was just buying the 30ml bottles for $49 because I didn't need the applicator for another $10. Here's what I did:
Go to Autozone and get the Eagle One tire swipes for $2
Now you have a new applicator that is bigger and easier to hold than the original. Besides that and the color, the high density foam block is the same material and so is the black soft foam part.
As for the suede cloth? Buy the small 10cm X 10cm 10 pack for $13from AG! CarPro Suede Microfiber Cloths, micro cloth, microfibre
So for $15, I have 2 better applicators and a 10 cloth towels and I can still buy my $49 kit.
If you want suede cloth for days, buy the huge 40cm X 40cm 10 pack for only $20 CarPro Suede Microfiber Cloths, suede microfibre cloths, microfiber towels, cquartz microfiber
<---My personal choice and MUCH better value. 4 times the amount for a little extra price.