This 'orchid nectar' is pretty common on many orchids and unfortunately, this also encourages a number of insects and ants in particular. They then also bring their pets like aphids and scale to the banquet. Bees are also regular visitors and use this nectar source when they are being starved for lack of wild flowers and general blossoms. For cleaning I use a gauze or Q-tip infused in warm water with liquid dish washing soap.