the two parties have not clearly stipulated in the lease agreement who will be responsible for cleaning and dredging. In accordance with the relevant provisions of the Contract Law, the lessor shall be responsible for cleaning and dredging. (The sewage pipes and septic tanks should be inside the leased building)

Contract Law

Article 218 If the lessee uses the leased property in the agreed way or in the nature of the leased property, thus causing losses to the leased property, it shall not be liable for damages.

Article 219 Where the lessee fails to use the lease item in accordance with the agreed method or the nature of the lease item, thereby causing losses to the lease item, the lessor may terminate the contract and demand compensation for the losses.

article 221th the lessor shall perform the maintenance obligations of the lease item, unless otherwise agreed by the parties.

article 221st the lessee may require the lessor to maintain the lease item within a reasonable period of time when it needs maintenance.

if the lessor fails to perform the maintenance obligations, the lessee can carry out the maintenance by himself, and the maintenance expenses shall be borne by the lessor. If the maintenance lease

affects the lessee's use, the rent shall be reduced or the lease term shall be extended accordingly.