that stupid looking clip will always leak, replace the clip with a properly designed band clamp and a proper pipe too. I dont know why japanese car makers use such useless clamps.
For the dash noises - there is a product called lockease that is made in USA - costs about 1 dollar only. Its a waxy grease crayon that is applied to door locks, plastic clips, plastic joints etc. Honda will sell you their silicone grease branded as shin etsu for this purpose but its a grease and not a wax.
A good job with the lockease stick will last for years.
You can try substituting it for a candle - or if you fancy - you can buy it from mercedes benz in a pretty little jar and pay about the equal of USD 60/- for it.