whoa - dont use anything like windowlene or clean green or meths etc - lcds are not flat like glass - when that stuff gets into those nooks and crannies you are out one screen
for LCD screens you are supposed to use just plain water - or a proportion of 5% rubbing alcohol and dilute that with 95% water - or you can find a solution that gives you a cleaning pad for around R45
heres a pic of what i found at the computershop in menlyn while i was on holiday in Gauteng (sorry forgot the name)

i bought these kits for R45 each - which is cheap - this is the water and alcohol mixture