tenant problems continuing

[Diego La Rotta]

long story short I bought a property with inherited tenant. They pay the rent on time and the rent is fair. On the property there is an attached storage which i had all the intend on using but since the tenant was already occupying it because it was in the lease agreement with the previous owner. The previous owner and the tenant agreed on that the tenant will use the storage unit to store his stuff. After the agreement the tenant was using the storage unit and it was a bit of a mess. I asked him to clean it up a little and organize the storage because the water heater is in the storage unit. He also has a bunch of canoes around the property. I asked him to clean and organize the storage unit to have space to get to the water heater and to get rid of the canoes because they are just laying around the property. A month later he kinda organized the outside the property but fast forward to now three months later it just got worse. The tenant has the storage with even more junk inside the storage and the outside he has all the canoes all around the property and a bunch of wood that he uses for his job. I have tried talking to him but he gets aggressive and says he will do it and never does it. 

what can I do to resolve this issue if he continues to do whatever he wants or if he gets aggressive when I go talk to him in person again. 

Thank in advance.