It is nice that climbers can respect the ethics that once you are done climbing to brush all the tick marks off the routes. Please take the time to clean the routes even if the ticks are not yours. The developers of these climbs have spent a lot of time, energy, effort, work and money to put the bolts into the rock and clean the plants. A brush costs less than 10 euro and can be used many times to keep the climbs clean for the next climber. It may only take 2/3 minutes to brush the holds on the route you just climbed. Thanks it is a the one simple thing every climber can do to give back to the community on kalymnos