Triumph Bonneville Bobber 2018 Owner's Handbook Manual page 122

Cleaning and Storage
Seat Care
Use of chemicals or high pressure
spray washers is not recommended for
cleaning the seat.
Using chemicals or high pressure spray
washers may damage the seat cover.
To help maintain its appearance, clean
the seat using a sponge or cleaning
cloth with soap and water.
122
Caution
Windscreen Cleaning
(if fitted)
Warning
Never attempt to clean the windscreen
while the motorcycle is in motion as
releasing the handlebars may cause
loss of motorcycle control and an
accident.
Operation of the motorcycle with a
damaged or scratched windscreen will
reduce the rider's forward vision. Any
such reduction in forward vision is
dangerous and may lead to loss of
motorcycle control and an accident.
Corrosive chemicals such as battery
acid will damage the windscreen. Never
allow corrosive chemicals to contact
the windscreen.
Caution