Caring for teak will vary depending on what sort of look you want to create and also whether it will be used under cover of totally outside. At Woodbury House we sell A Grade teak with a super fine sanded finish. This means it is raw timber with no oils or stains applied. Most people love the way teak looks unfinished (provided it is A Grade) and have no desire to apply oil. Others however prefer the oiled look. If so we recommend Sikkens products Sadolin Hardwood oil or Sikkens HLS. We carry a range of these oils providing various colour options in our Sydney store. Once an oil is applied it needs to be re-oiled once every year or two if it is kept in an undercover environment (please note if Sadolin Hardwood oil "clear" is chosen it needs to be applied more frequently because there is no pigment in this oil).
If the furniture is to be used totally outside, exposed to full weather, first it is important to make a choice as to whether or not you like the weathered teak look. Unlike other timbers that weather to a muddy grey, good quality teak weathers to a beautiful silver grey colour. It is quite popular and many people buy A grade teak for this reason. If you choose this path then once a year simply clean the furniture with soapy water. If you change your mind about this later you can always clean the furniture with a high pressure hose and get it back to its origial colour.
The alternative options for outside are to apply oils or to use a furniture cover. We sell high quality water proof furniture covers made by Shelta Australia. They have strong velcro components that simply go around the base the furniture. The covers are big enough to cover a whole setting including chairs. The other option is to apply oils. As mentioned above, there are specific oils we recommend. In an outside environment these would need to be reapplied approximately every 12 months.
An example of weathered A grade teak