If there are still some dust blobs, unclip the ribbon connectors with your finger-nail and remove the board (four screws). You can then spray out the whole optical block.
如果仍然有灰尘，用你的指甲把排线拔掉然后把主板移走（有四颗螺丝）。你可以接着喷整个光学部件。
2
The utility model is of simple structure, easy taken-with, convenient utilization, no injury on finger and remove of remained nail with little force.