For controlling creeping oxalis in buffalo lawn, we recommend 'Yates Buffalo Pro Weedkiller Concentrate', kills bindii, clover & other broadleaf weeds in Buffalo, Kikuyu, Couch and other common grass lawns. Click here for more info on this product: https://www.yates.com.au/product/lawn/lawn-weed-control/yates-buffalopro-weed-killer-concentrate

Product may be reapplied if weeds are persistent after 4 weeks.

This can be applied using a sprayer or watering can - watering can application is effective for keeping weed killer away from plants.  Better for smaller areas of lawn surrounded by gardens.  Easier to control.