You should go to tesco to buy some microfiber clothes at only rm 10+ with 3 clothes. Also use car shampoo, because water won't do much cleaning off dirty and grime if your car is dirty or hasn't wash for weeks. Water only used when your car is very pristinely clean.

Step 1. Prepare two bucket one for the car shampoo and another with only water for rinsing your washing cloth

Step 2. Wash the hood then bonnet and boot. After that only wash the door panel and lastly the bumpers. Remember to frequently rinse your washing cloth. To clear off dusty and dirt.

Step 3 rinse your car thoroughly with the hose. And use a microfiber towel ( wet the cloths first ) to dry your car with the same procedure hood, bonnet, boot those....

Step 4 if your car is dirty. Go aeon or any automobile store to get a clay bar for car. And clay every surface of your car. Also remember to use the car soap for lubricatio while clay bar the car.

Finally, your car is super clean so you can apply a layer of wax or sealant. Apply by section and wait the wax or sealant to dry and buff it off.

After the you should maintain your car by washing it at least once per week and remember to top up the wax on your car around once per month it depends on where you park your car

Most would recommend a Dual Action Polisher. Would make you save enormous chunk of time.

Clay bar looks like a bar of soap. But its consistency is like moulding clay or plastercine. you should rip off a piece and flatten it then use it to scrub gently on car surface.
To use it you need to use the soapy solution when you wash your car to lubricate your car surface before you use the clay bar on the surface. If you dont lubricate the surface...will cause scratches to your paint.
Clay bars will remove more of the dirt(harder to removed dirt) on the surface of your car which ordinary car wash cant remove.
It can remove wax and sealant too....

you can get from :
aikka.com.my - 600++
antirain.com (ryobi) - ??
Osren.com (dap8/dap15) 750/950