JazakAllah for liking Ahmad bhai,
buss aap hi ka sikhaya hua hai.
Honestly, my work is far from flawless, there are many things you overlook on purpose 
About the Quik Interior detailer, its a great product. It is one meguiars product that i'm not afraid to use regularly. I've been using it every ~1.5 weeks on all plastic trims very liberally. It cleans and protects in one easy step. Two sprays are more than enough for the whole dashboard and then half a spray per door card. Spread out with an even coat applicator pad and it will use even less while the microfibers will scrub out and trap dirt particles in their nap.
This time the interior was excessively dirty so i gave an apc wipe which was diluted 1:12.
Btw- i dont clean my dashboard all week and right now it looks completely different:P