WHY SHOULD YOU HAVE TO PARTICIPARE UP IN A CAMPAIGN

For me, it's more than just a clean up. It's a way to be a good person. we will be interacting with many people and experiencing more.
Rubbish doesn't appear in the forest by itself. It is taken there by people who don't care, and I'm sure they are actually a minority. The majority of people are good, but when a good, caring, ethical and tidy person walks through a forest, he or she leaves behind as few traces as possible. That's why rubbish - a sign of of ignorance, stupidity and arrogance - often dominates the landscape and creates an impression that these arrogant, littering people are dominating in the society and the thing they do is somehow normal.
Anyway, they are not a majority. The cleanup action is a way to prove it, it's a way for the good people to come out and show that they exist, they care, they are ready to change things into better, and there are really many of them. So, besides the cleaner landscapes you also get more optimism and courage in the society. It links the local communities, gives active and caring people a chance to meet each other and keep on doing something good also after the cleanup.
Moreso, a cleanup is something very universal. Despite any cultural, linguistic, religious or other differences a clean environment without rubbish is very appreciated. So, it's a great possibility also for different communities in one country to find some common goal and work together for that, as well as a way to find more goals that everybody agrees with.
So, a successful cleanup is not only a way to clean up the environment, to make your country a more beautiful place to live and visit, but it's also a way for the good people to show that they exist and they care, and it's a favour for the society. 
To start this process, there must be a good, motivated, friendly and active team of organisers. You are the one who starts, shapes and leads this historical process in your country. Yes, you. And you're not alone - there are people worried about the same problems and resolving them in the whole country. They are with you.