How to clean with a stylus brush.
Free the arm from the armrest/lock and leave the cart between rest and platter. Lower the lift and allow the arm to drop to its lowest level in that open space. The arm will now be free to move upwards in response to any pressure on the stylus. You are probably tracking between 2g and 2.5g. Load your chosen stylus brush with a small drop of your chosen stylus cleaning fluid and brush it longitudinally along the stylus from back to front - no sideways force. Yes, leave the sound on low so you can hear what you are doing. Repeat brushstrokes 6 or 8 times. If you apply too much upward force the arm will just lift in response, so you will never apply more than the downforce you have set on the arm. The cantilever and suspension are designed to withstand a bit more than the 2.5g downforce as when playing a record the stylus is dropped onto its surface and will react to the downward force.
Assuming you did this you will not have damaged the stylus or suspension of the cart.