The products you use should be designed for your boots’ specific fabric. Timberland boots come in suede and leather styles, but the traditional Timberland boot is make of nubuck. Suede and nubuck can typically be cleaned with the same cleaner.  Make sure to buy leather cleaning supplies that match the color of your leather. Look on the packaging of a potential product and make sure that it can clean the yellow leather that a Timberland boot is usually made of. If you are unsure of what product to purchase, go to your local boot and shoe repair store and ask if they sell any products that would be appropriate. Take the shoelaces from each boot and set them aside if they are clean. If they are not clean, wash them by hand and let them dry completely before putting them back in your boots.  Wash the laces in warm soapy water until all of the dirt has been removed. For a thorough cleaning job, scrub them together with the soap and then soak them in warm water. Once cleaned, hang them out to dry. You could also include them in a load of laundry in a washing machine. Keep in mind that if they are really dirty, you will probably want to wash them separately from your clothes. Brush off each boot with a brush to remove any dirt particles. Use a light touch, as you don't want to scratch the surface of your boots, but your soft-bristle brush should be safe for your boots. Removing as much dirt as possible at the beginning will minimize the amount of scrubbing you have to do later on.  Don't forget the bottom of the Timberlands. The soles are especially likely to pick up loose dirt and gravel that can be brushed off easily before cleaning. If you don’t brush this dirt off, you’re likely to have a muddy mess on your hands and in your house. Brushes work better than towels simply because they can get into the nooks and crannies of the boots; however, be careful when using a brush on leather boots, as brushes with very hard bristles may scratch the leather. While cleaning the boot, you need to focus on keeping its shape...

TL;DR in Indonesian:
Beli produk pembersih dan lapisan pelindung yang sesuai dengan sepatu bot. Lepas tali sepatunya. Hilangkan serpihan dan kotoran yang telah longgar dengan sikat berbulu lembut. Masukkan salah satu tangan ke dalam bot. Gosok sol sepatu dengan sikat gigi dan sabun cuci piring yang ringan. Gosok bagian luar bot dengan air dan pembersih. Bersihkan noda yang tersisa dengan ampelas. Bilas permukaan sepatu menggunakan sedikit air. Lakukan pembersihan secara menyeluruh (deep cleaning) jika perlu.