In summer, just after Fajar prayer is best time to wash the car and good exercise too 
Yes will try that. CG Citrus wash and gloss is super concentrated. I used just a couple of drops in bucket and works wonders.
You can safely use with a mild handwash solution. Just few drops in a bucket with little water and dip the mf towel for sometime and rub gently and rinse.
Mospel works for a couple of hours.