If your Hong Kong dollar is only moldy, without missing corners and rot, it will not affect your use. You can change it at the bank. Don't worry about changing it.
In addition, if it is slightly moldy, just blow it with a hair dryer.
The recovery of paper money is the task of banks, and has nothing to do with the holders. Don't worry about flowers.
Exchange rate between Hong Kong dollar and RMB:
Way:
1. Attach the foreign exchange market trend to the futures foreign exchange market software.
2. Major financial websites also have foreign exchange quotations.
3. You can also check the exchange rate through the foreign exchange inquiry tool that comes with your mobile phone.
4. Most mobile phone futures market softwares also have exchange rates of major currencies.
Precautions:
The exchange rate is constantly changing. Please refer to the current exchange rate of the day you need when using it. The exchange of bank counters and online banking is subject to the real-time quotation at that time.
For example, the latest exchange rate query, enter "Hong Kong dollar and RMB exchange rate" in Baidu, and you can directly see the latest exchange rate.