✔ 最佳答案
You can go to website :
www.wellconnected.com.hk looking for BC-01( toilet & bathroom cleaner ) . The catalog will tell you detail how to clean your tiles & the sealant too . But if the dirt on the sealant is not deeply rooted into it , BC-01 can work well . If it is old mould , the cleaner cannot remove the dirt . Even bleach does not work ! You have to scratch it away & put the new one onto the gaps .