To prevent further damage to the stained area, test the product on a hidden area of your floor before applying it to the stain. Select a spot beneath a coffee table or covered by a couch.  Spray the WD-40 directly onto the test spot. Allow it to sit on the hardwood for 3 to 5 minutes. Remove the product with a clean, wet rag. Spray the test area with a stain remover to get rid of any greasy residue. Wipe up the spray with a damp sponge. Look at the test spot and determine if the product has removed the finish on your floor or left behind a stain. If the test spot is damaged, choose a different method of stain removal. Apply the WD-40 directly to the stain. Allow the product to sit for 3 to 5 minutes. You may also spray some WD-40 onto a clean cloth and apply it to the stained area. Run a clean cloth under the tap or dip it in a small bucket of fresh water. Wring out the rag. Remove the WD-40 from the surface. If the stain remains, re-apply the WD-40. Allow it to sit for 5 to 7 minutes before wiping the surface with a damp rag. Spray the treated area with a stain remover. This will remove any greasy residue left behind by the WD-40. Wipe the area with a damp sponge or cloth. Once the stain remover is cleaned up, run over the area with a dry cloth to pick up any remaining moisture.

TL;DR in Indonesian:
Cobalah untuk mengetes penggunaan WD-40 di area lantai yang tertutup terlebih dahulu, sebelum Anda menggunakannya langsung pada noda. Jika WD-40 tidak merusak lantai, semprotkan produk tersebut langsung ke atas noda dan biarkan selama tiga sampai lima menit. Setelah dibiarkan selama tiga sampai lima menit, lap noda dengan kain basah. Bersihkan sisa-sisa residu berminyak dari semprotan WD-40 dengan pembersih noda.