you claim to have a trumpet teacher. What do they say? We have been giving you weeks of information that you seem to have some trouble understanding.
Cold water and no brush is a waste of time when trying to clean a trumpet.
Learning to play the trumpet over the internet is a waste of time because you have no idea who is right. If you take everybodies advice you will fail as not all of it is good and some of it is offered by players with about the qualifications you seem to have.
If you lived in Germany, I would have tried to visit you and given you (and your teacher) a free lesson or two. After that I would know for sure if you are for real or a troll. I find it impossible to believe that the teacher that you claim to have could be so worthless.