*Chikselog: Yes they have Carlack LLS, its around 1.4 to 1.6k i think? The M20 has very light cleaners but not as good as Step 1, if thats what you are asking. The Carlack LLS is a pure sealant and it does not contain any cleaners.

If you are going to use it, it should be Step 2, LLS and then Step 3. But i guess it might give you some bonding issues though since the Step 2 has some oils in it and this might cause LLS to not bond properly to the paint. If you want to apply a sealant on your car, you could do 2 things

1. Apply Step 2 as you normally would, do a 50/50 IPA wipe down ( just dilute 50% Isopropyl Alcohol with 50% Distilled Water, spray it to the paint panel by panel and wipe it dry ) to remove the oils, it will still give you that extra gloss from Step 2 and the added filling properties, this just removes the oils, then apply LLS, wait for 24 hours to cure properly ( its important not to drive the car around so you don't have to re-wash ) then do a QD wipe down to clean the car and apply the wax.

2. Apply Step 2, Get the Carlack NSC instead ( it also offers a nice gloss but has a little less durability than the LLS but still good ) and then go directly to Step 3.

As for Degreasers, Simple Green MAX is good, I use Mark V Degreaser as well as a degreaser i bought via carbouy locally and both works well, though i have Megs and other products i just save them for euro cars but honestly its all the same for me, it all boils down to concentration actually. What i normally do is spray kerosene and let it sit for about 2 minutes and then re-spray the wheel wells, and then wait for 3 to 5 minutes depending on when i see the asphalt melt and drip down. The thats the time i spray the degreaser to remove the kerosene and then soak the grime up for about another 5 minutes before i use a extended handle brush and work the grime out. I finish it up with either dressings or cleaner waxes, depending on the surface of the wheel wells.