Dogging is a fun experience but there are rules of Dogging that everyone needs to follow.
A dirty appearance and smell is a turn-off, so if you plan on joining in with a couple, make yourself presentable
If you've used condoms then make sure that you dispose of them in a bin and not just throw them out of your car.
If you want another couple to follow you to a more secluded spot then flash your headlights once and drive to where you want to be. If they are interested then they will follow. If you want your audience to touch and interact with you then roll down your window or open the car doors.
A flash of the interior light means they want to be watched. A rolled down window is an invitation to get closer and maybe touch. But make sure the couple is actually dogging; they may have just dropped the keys on the floorboard or need fresh air.
Don't join in unless the couple asks you to.
Be appreciative but respectful. "Get your tits out" is not the way to behave.
Use the Let's Go Dogging database to find the action but remember that sometimes the fun doesn't start on time.