Apple's mobile phone WeChat and qq occupy a large amount of memory, and the cleaning method is as follows (taking QQ as an example):

As shown in the figure below, QQ on this iPhone has occupied 280M of space, and it is still not used much. If you use QQ frequently, it will take up more capacity.

First of all, it is natural to log in your QQ account on the iPhone, as shown in the figure.

Next, please click the QQ icon in the upper right corner to enter the setting interface, as shown in the figure.

Then, please click the setting option at the bottom left, as shown in the figure.

Then, in the settings list, click the option in the chat history column, as shown.

Then you can see in the list that there is an option to clear the cached data, through which you can clear the cached data on QQ.

Then click the clear cache data button at the bottom, as shown.

After emptying, look back at the space occupied by QQ on iPhone, which will be much smaller.