As title, how to clean the fan inside while now open the bottom only see ram and others, now fan not shown, is it need to open all out then can clean?

As title, how to clean the fan inside while now open the bottom only see ram and others not like G75 which still can see Fan, now fan not shown, is it need to open all out then can clean?

As title, how to clean the fan inside while now open the bottom only see ram and others, now fan not shown, is it need to open all out then can clean?:confused: